import math
a=float(input("Enter a: "))
b=float(input("Enter b: "))
c=float(input("Enter c: "))
D=(b**2)-(4*a*c)
if(D
print("haven't any values")
elif(D==0):
x=-b/2*a
print("x =",x)
else:
x1=(-b-math.sqrt(D))/2*a
x2=(-b+math.sqrt(D))/2*a
print("x1 =",x1,"x2 =",x2)